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This is Scientific American 60-Second Science. I'm Sophie Bushwick. Got a minute?

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A volcanic eruption hurls ash particles and gas high into the sky.

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Once airborne, these substances circle the globe, scattering sunlight more and giving sunsets a redder color.

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The effect only lasts for a few years, but paintings by gifted artists can preserve it for centuries.

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And give us clues about past air quality.

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Between the years 1500 and 2000, some 50 major volcanic eruptions occurred all over the world.

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Meanwhile, artists painted thousands of sunsets.

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To see if such paintings could reveal atmospheric info, researchers analyzed high-quality digital photos of the art for the balance of red and green colors along the horizon.

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Based on the red-green ratio, they calculated the amount of particles in the atmosphere.

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These numbers indeed corresponded with recent volcanic eruptions.

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And they also reflected an increase in airborne particles after the industrial revolution.

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The research is in the journal Atmospheric Chemistry and Physics.

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For much of human history, we had no instruments to measure air quality.

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But this study shows that great painters may shed light on past pollution.

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Thanks for the minute, for Scientific American 60-Second Science. I'm Sophie Bushwick.

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